Vulnerable communities uprooted by climate change are being left out of a voluntary pact to deal with migration, campaigners said, after the United States pulled out of the global deal.Although people within low-lying states are being forced to relocate because of worsening storms and rising seas, they will not be recognized in U.N. migration pact talks next year, putting lives at risk, campaigners said."Many of the situations we find ourselves in, here in the Pacific, are...